# RP2040-ETH WS2812 Network Control

This implementation adds ethernet connectivity to the WS2812 LED control, allowing you to control the LED color over the network.

## Hardware Setup

- **Board**: Waveshare RP2040-ETH
- **LED**: WS2812 connected to GPIO 25
- **Ethernet**: CH9120 chip handles TCP/IP communication

## Network Configuration

Default settings (can be modified in `ch9120.c`):
- **IP Address**: 192.168.1.200
- **Port**: 1000
- **Mode**: TCP Client
- **Target IP**: 192.168.1.10
- **Target Port**: 2000

## Building

```bash
cd build
cmake ..
make barnum_eth
```

## Flashing

1. Hold BOOTSEL button and connect USB
2. Copy `barnum_eth.uf2` to the RPI-RP2 drive
3. The board will reboot automatically

## Usage

### Supported Commands

Send these commands as TCP messages to control the LED:
- `RED` - Set LED to red
- `GREEN` - Set LED to green  
- `BLUE` - Set LED to blue
- `WHITE` - Set LED to white
- `OFF` - Turn LED off
- `RGB:r,g,b` - Set custom color (e.g., `RGB:255,128,0` for orange)

### Python Test Client

Use the included `test_client.py` to test:

```bash
# Run demo sequence
python3 test_client.py

# Send single command
python3 test_client.py "RGB:255,0,255"
```

### Features

- Smooth color transitions between commands
- Network status feedback via USB serial
- Acknowledgment messages for each command

## Pin Assignments

- **WS2812 Data**: GPIO 25
- **UART TX (CH9120)**: GPIO 20
- **UART RX (CH9120)**: GPIO 21
- **CFG (CH9120)**: GPIO 18
- **RES (CH9120)**: GPIO 19

## Troubleshooting

1. **No network connection**: 
   - Check ethernet cable is connected
   - Verify IP settings match your network
   - Use serial monitor to see debug output

2. **LED not responding**:
   - Verify WS2812 is connected to GPIO 25
   - Check power supply to LED
   - Monitor serial output for errors

3. **Can't flash the board**:
   - Make sure to use the correct board setting in CMakeLists.txt
   - The board type is already set to `waveshare_rp2040_eth`